Optimization of rotor of actual IPM motor using ON/OFF method

For the design of an IPM motor with small torque ripple and large driving torque, the optimal design method called the ON/OFF method is attractive, because new magnetic circuit, which we could not imagined beforehand, may be obtained. In this paper, a non-parametric optimization technique to find a new magnetic circuit which minimize a torque ripple and maximize a driving torque of IPM motor is examined. Factors affecting torque ripple and driving torque are discussed by using the obtained optimal magnetic circuit of the IPM motor.